/*
 * Copyright (C) 2008 ZXing authors
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.zxing.client.android;


import java.io.IOException;
import java.text.DateFormat;
import java.util.Date;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.Vector;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.preference.PreferenceManager;
import android.text.ClipboardManager;
import android.util.Log;
import android.util.TypedValue;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.Result;
import com.google.zxing.ResultMetadataType;
import com.google.zxing.ResultPoint;
import com.google.zxing.client.android.camera.CameraManager;
import com.google.zxing.client.android.history.HistoryManager;
import com.google.zxing.client.android.result.ResultButtonListener;
import com.google.zxing.client.android.result.ResultHandler;
import com.google.zxing.client.android.result.ResultHandlerFactory;
import com.google.zxing.client.android.result.supplement.SupplementalInfoRetriever;


/**
 * The barcode reader activity itself. This is loosely based on the CameraPreview
 * example included in the Android SDK.
 * 
 * @author dswitkin@google.com (Daniel Switkin)
 * @author Sean Owen
 */
public final class CaptureActivity
		extends Activity
		implements SurfaceHolder.Callback
{

	private static final String TAG = CaptureActivity.class.getSimpleName();

	private static final int SHARE_ID = Menu.FIRST;
	private static final int HISTORY_ID = Menu.FIRST + 1;
	private static final int SETTINGS_ID = Menu.FIRST + 2;
	private static final int HELP_ID = Menu.FIRST + 3;
	private static final int ABOUT_ID = Menu.FIRST + 4;

	private static final long INTENT_RESULT_DURATION = 1500L;
	private static final long BULK_MODE_SCAN_DELAY_MS = 1000L;

	private static final String PACKAGE_NAME = "com.google.zxing.client.android";
	private static final String PRODUCT_SEARCH_URL_PREFIX = "http://www.google";
	private static final String PRODUCT_SEARCH_URL_SUFFIX = "/m/products/scan";
	private static final String ZXING_URL = "http://zxing.appspot.com/scan";
	private static final String RETURN_CODE_PLACEHOLDER = "{CODE}";
	private static final String RETURN_URL_PARAM = "ret";

	private static final Set<ResultMetadataType> DISPLAYABLE_METADATA_TYPES;
	static
	{
		DISPLAYABLE_METADATA_TYPES = new HashSet<ResultMetadataType>(5);
		DISPLAYABLE_METADATA_TYPES.add(ResultMetadataType.ISSUE_NUMBER);
		DISPLAYABLE_METADATA_TYPES.add(ResultMetadataType.SUGGESTED_PRICE);
		DISPLAYABLE_METADATA_TYPES.add(ResultMetadataType.ERROR_CORRECTION_LEVEL);
		DISPLAYABLE_METADATA_TYPES.add(ResultMetadataType.POSSIBLE_COUNTRY);
	}

	private enum Source
	{
		NATIVE_APP_INTENT,
		PRODUCT_SEARCH_LINK,
		ZXING_LINK,
		NONE
	}

	private CaptureActivityHandler handler;
	private ViewfinderView viewfinderView;
	private TextView statusView;
	private View resultView;
	private Result lastResult;
	private boolean hasSurface;
	private boolean copyToClipboard;
	private Source source;
	private String sourceUrl;
	private String returnUrlTemplate;
	private Vector<BarcodeFormat> decodeFormats;
	private String characterSet;
	private String versionName;
	private HistoryManager historyManager;
	private InactivityTimer inactivityTimer;
	private BeepManager beepManager;

	private final DialogInterface.OnClickListener aboutListener =
			new DialogInterface.OnClickListener() {
				public void onClick(DialogInterface dialogInterface, int i)
				{
					Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(getString(R.string.zxing_url)));
					intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
					startActivity(intent);
				}
			};

	ViewfinderView getViewfinderView()
	{
		return viewfinderView;
	}

	public Handler getHandler()
	{
		return handler;
	}

	@Override
	public void onCreate(Bundle icicle)
	{
		super.onCreate(icicle);

		Window window = getWindow();
		window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
		setContentView(R.layout.capture);

		CameraManager.init(getApplication());
		viewfinderView = (ViewfinderView) findViewById(R.id.viewfinder_view);
		resultView = findViewById(R.id.result_view);
		statusView = (TextView) findViewById(R.id.status_view);
		handler = null;
		lastResult = null;
		hasSurface = false;
		historyManager = new HistoryManager(this);
		historyManager.trimHistory();
		inactivityTimer = new InactivityTimer(this);
		beepManager = new BeepManager(this);

		showHelpOnFirstLaunch();
	}

	@Override
	protected void onResume()
	{
		super.onResume();
		resetStatusView();

		SurfaceView surfaceView = (SurfaceView) findViewById(R.id.preview_view);
		SurfaceHolder surfaceHolder = surfaceView.getHolder();
		if (hasSurface)
		{
			// The activity was paused but not stopped, so the surface still exists. Therefore
			// surfaceCreated() won't be called, so init the camera here.
			initCamera(surfaceHolder);
		} else
		{
			// Install the callback and wait for surfaceCreated() to init the camera.
			surfaceHolder.addCallback(this);
			surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
		}

		Intent intent = getIntent();
		String action = intent == null ? null : intent.getAction();
		String dataString = intent == null ? null : intent.getDataString();
		if (intent != null && action != null)
		{
			if (action.equals(Intents.Scan.ACTION))
			{
				// Scan the formats the intent requested, and return the result to the calling activity.
				source = Source.NATIVE_APP_INTENT;
				decodeFormats = DecodeFormatManager.parseDecodeFormats(intent);
				if (intent.hasExtra(Intents.Scan.WIDTH) && intent.hasExtra(Intents.Scan.HEIGHT))
				{
					int width = intent.getIntExtra(Intents.Scan.WIDTH, 0);
					int height = intent.getIntExtra(Intents.Scan.HEIGHT, 0);
					if (width > 0 && height > 0)
					{
						CameraManager.get().setManualFramingRect(width, height);
					}
				}
			} else if (dataString != null && dataString.contains(PRODUCT_SEARCH_URL_PREFIX) &&
					dataString.contains(PRODUCT_SEARCH_URL_SUFFIX))
			{
				// Scan only products and send the result to mobile Product Search.
				source = Source.PRODUCT_SEARCH_LINK;
				sourceUrl = dataString;
				decodeFormats = DecodeFormatManager.PRODUCT_FORMATS;
			} else if (dataString != null && dataString.startsWith(ZXING_URL))
			{
				// Scan formats requested in query string (all formats if none specified).
				// If a return URL is specified, send the results there. Otherwise, handle it ourselves.
				source = Source.ZXING_LINK;
				sourceUrl = dataString;
				Uri inputUri = Uri.parse(sourceUrl);
				returnUrlTemplate = inputUri.getQueryParameter(RETURN_URL_PARAM);
				decodeFormats = DecodeFormatManager.parseDecodeFormats(inputUri);
			} else
			{
				// Scan all formats and handle the results ourselves (launched from Home).
				source = Source.NONE;
				decodeFormats = null;
			}
			characterSet = intent.getStringExtra(Intents.Scan.CHARACTER_SET);
		} else
		{
			source = Source.NONE;
			decodeFormats = null;
			characterSet = null;
		}

		SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
		copyToClipboard = prefs.getBoolean(PreferencesActivity.KEY_COPY_TO_CLIPBOARD, true)
				&& (intent == null || intent.getBooleanExtra(Intents.Scan.SAVE_HISTORY, true));

		beepManager.updatePrefs();

		inactivityTimer.onResume();
	}

	@Override
	protected void onPause()
	{
		super.onPause();
		if (handler != null)
		{
			handler.quitSynchronously();
			handler = null;
		}
		inactivityTimer.onPause();
		CameraManager.get().closeDriver();
	}

	@Override
	protected void onDestroy()
	{
		inactivityTimer.shutdown();
		super.onDestroy();
	}

	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event)
	{
		if (keyCode == KeyEvent.KEYCODE_BACK)
		{
			if (source == Source.NATIVE_APP_INTENT)
			{
				setResult(RESULT_CANCELED);
				finish();
				return true;
			} else if ((source == Source.NONE || source == Source.ZXING_LINK) && lastResult != null)
			{
				resetStatusView();
				if (handler != null)
				{
					handler.sendEmptyMessage(R.id.restart_preview);
				}
				return true;
			}
		} else if (keyCode == KeyEvent.KEYCODE_FOCUS || keyCode == KeyEvent.KEYCODE_CAMERA)
		{
			// Handle these events so they don't launch the Camera app
			return true;
		}
		return super.onKeyDown(keyCode, event);
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu)
	{
		super.onCreateOptionsMenu(menu);
		// menu.add(0, SHARE_ID, 0, R.string.menu_share)
		// .setIcon(android.R.drawable.ic_menu_share);
		// menu.add(0, HISTORY_ID, 0, R.string.menu_history)
		// .setIcon(android.R.drawable.ic_menu_recent_history);
		menu.add(0, SETTINGS_ID, 0, R.string.menu_settings)
				.setIcon(android.R.drawable.ic_menu_preferences);
		menu.add(0, HELP_ID, 0, R.string.menu_help)
				.setIcon(android.R.drawable.ic_menu_help);
		menu.add(0, ABOUT_ID, 0, R.string.menu_about)
				.setIcon(android.R.drawable.ic_menu_info_details);
		return true;
	}

	// Don't display the share menu item if the result overlay is showing.
	@Override
	public boolean onPrepareOptionsMenu(Menu menu)
	{
		super.onPrepareOptionsMenu(menu);
		// menu.findItem(SHARE_ID).setVisible(lastResult == null);
		return true;
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item)
	{
		switch (item.getItemId())
		{
		// case SHARE_ID:
		// {
		// Intent intent = new Intent(Intent.ACTION_VIEW);
		// intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
		// intent.setClassName(this, ShareActivity.class.getName());
		// startActivity(intent);
		// break;
		// }
		// case HISTORY_ID:
		// {
		// AlertDialog historyAlert = historyManager.buildAlert();
		// historyAlert.show();
		// break;
		// }
		case SETTINGS_ID:
		{
			Intent intent = new Intent(Intent.ACTION_VIEW);
			intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
			intent.setClassName(this, PreferencesActivity.class.getName());
			startActivity(intent);
			break;
		}
		case HELP_ID:
		{
			Intent intent = new Intent(Intent.ACTION_VIEW);
			intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
			intent.setClassName(this, HelpActivity.class.getName());
			startActivity(intent);
			break;
		}
		case ABOUT_ID:
			AlertDialog.Builder builder = new AlertDialog.Builder(this);
			builder.setTitle(getString(R.string.title_about) + versionName);
			builder.setMessage(getString(R.string.msg_about) + "\n\n" + getString(R.string.zxing_url));
			builder.setIcon(R.drawable.launcher_icon);
			builder.setPositiveButton(R.string.button_open_browser, aboutListener);
			builder.setNegativeButton(R.string.button_cancel, null);
			builder.show();
			break;
		}
		return super.onOptionsItemSelected(item);
	}

	public void surfaceCreated(SurfaceHolder holder)
	{
		if (!hasSurface)
		{
			hasSurface = true;
			initCamera(holder);
		}
	}

	public void surfaceDestroyed(SurfaceHolder holder)
	{
		hasSurface = false;
	}

	public void surfaceChanged(SurfaceHolder holder, int format, int width, int height)
	{

	}

	/**
	 * A valid barcode has been found, so give an indication of success and show the results.
	 * 
	 * @param rawResult The contents of the barcode.
	 * @param barcode A greyscale bitmap of the camera data which was decoded.
	 */
	public void handleDecode(Result rawResult, Bitmap barcode)
	{
		inactivityTimer.onActivity();
		lastResult = rawResult;
		ResultHandler resultHandler = ResultHandlerFactory.makeResultHandler(this, rawResult);
		historyManager.addHistoryItem(rawResult, resultHandler);

		if (barcode == null)
		{
			// This is from history -- no saved barcode
			handleDecodeInternally(rawResult, resultHandler, null);
		} else
		{
			beepManager.playBeepSoundAndVibrate();
			drawResultPoints(barcode, rawResult);
			switch (source)
			{
			case NATIVE_APP_INTENT:
			case PRODUCT_SEARCH_LINK:
				handleDecodeExternally(rawResult, resultHandler, barcode);
				break;
			case ZXING_LINK:
				if (returnUrlTemplate == null)
				{
					handleDecodeInternally(rawResult, resultHandler, barcode);
				} else
				{
					handleDecodeExternally(rawResult, resultHandler, barcode);
				}
				break;
			case NONE:
				SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
				if (prefs.getBoolean(PreferencesActivity.KEY_BULK_MODE, false))
				{
					Toast.makeText(this, R.string.msg_bulk_mode_scanned, Toast.LENGTH_SHORT).show();
					// Wait a moment or else it will scan the same barcode continuously about 3 times
					if (handler != null)
					{
						handler.sendEmptyMessageDelayed(R.id.restart_preview, BULK_MODE_SCAN_DELAY_MS);
					}
					resetStatusView();
				} else
				{
					handleDecodeInternally(rawResult, resultHandler, barcode);
				}
				break;
			}
		}
	}

	/**
	 * Superimpose a line for 1D or dots for 2D to highlight the key features of the barcode.
	 * 
	 * @param barcode A bitmap of the captured image.
	 * @param rawResult The decoded results which contains the points to draw.
	 */
	private void drawResultPoints(Bitmap barcode, Result rawResult)
	{
		ResultPoint[] points = rawResult.getResultPoints();
		if (points != null && points.length > 0)
		{
			Canvas canvas = new Canvas(barcode);
			Paint paint = new Paint();
			paint.setColor(getResources().getColor(R.color.result_image_border));
			paint.setStrokeWidth(3.0f);
			paint.setStyle(Paint.Style.STROKE);
			Rect border = new Rect(2, 2, barcode.getWidth() - 2, barcode.getHeight() - 2);
			canvas.drawRect(border, paint);

			paint.setColor(getResources().getColor(R.color.result_points));
			if (points.length == 2)
			{
				paint.setStrokeWidth(4.0f);
				drawLine(canvas, paint, points[0], points[1]);
			} else if (points.length == 4 &&
					(rawResult.getBarcodeFormat().equals(BarcodeFormat.UPC_A) ||
					rawResult.getBarcodeFormat().equals(BarcodeFormat.EAN_13)))
			{
				// Hacky special case -- draw two lines, for the barcode and metadata
				drawLine(canvas, paint, points[0], points[1]);
				drawLine(canvas, paint, points[2], points[3]);
			} else
			{
				paint.setStrokeWidth(10.0f);
				for (ResultPoint point : points)
				{
					canvas.drawPoint(point.getX(), point.getY(), paint);
				}
			}
		}
	}

	private static void drawLine(Canvas canvas, Paint paint, ResultPoint a, ResultPoint b)
	{
		canvas.drawLine(a.getX(), a.getY(), b.getX(), b.getY(), paint);
	}

	// Put up our own UI for how to handle the decoded contents.
	private void handleDecodeInternally(Result rawResult, ResultHandler resultHandler, Bitmap barcode)
	{
		statusView.setVisibility(View.GONE);
		viewfinderView.setVisibility(View.GONE);
		resultView.setVisibility(View.VISIBLE);

		ImageView barcodeImageView = (ImageView) findViewById(R.id.barcode_image_view);
		if (barcode == null)
		{
			barcodeImageView.setImageBitmap(BitmapFactory.decodeResource(getResources(),
					R.drawable.launcher_icon));
		} else
		{
			barcodeImageView.setImageBitmap(barcode);
		}

		TextView formatTextView = (TextView) findViewById(R.id.format_text_view);
		formatTextView.setText(rawResult.getBarcodeFormat().toString());

		TextView typeTextView = (TextView) findViewById(R.id.type_text_view);
		typeTextView.setText(resultHandler.getType().toString());

		DateFormat formatter = DateFormat.getDateTimeInstance(DateFormat.SHORT, DateFormat.SHORT);
		String formattedTime = formatter.format(new Date(rawResult.getTimestamp()));
		TextView timeTextView = (TextView) findViewById(R.id.time_text_view);
		timeTextView.setText(formattedTime);

		TextView metaTextView = (TextView) findViewById(R.id.meta_text_view);
		View metaTextViewLabel = findViewById(R.id.meta_text_view_label);
		metaTextView.setVisibility(View.GONE);
		metaTextViewLabel.setVisibility(View.GONE);
		Map<ResultMetadataType, Object> metadata =
				(Map<ResultMetadataType, Object>) rawResult.getResultMetadata();
		if (metadata != null)
		{
			StringBuilder metadataText = new StringBuilder(20);
			for (Map.Entry<ResultMetadataType, Object> entry : metadata.entrySet())
			{
				if (DISPLAYABLE_METADATA_TYPES.contains(entry.getKey()))
				{
					metadataText.append(entry.getValue()).append('\n');
				}
			}
			if (metadataText.length() > 0)
			{
				metadataText.setLength(metadataText.length() - 1);
				metaTextView.setText(metadataText);
				metaTextView.setVisibility(View.VISIBLE);
				metaTextViewLabel.setVisibility(View.VISIBLE);
			}
		}

		TextView contentsTextView = (TextView) findViewById(R.id.contents_text_view);
		CharSequence displayContents = resultHandler.getDisplayContents();
		contentsTextView.setText(displayContents);
		// Crudely scale betweeen 22 and 32 -- bigger font for shorter text
		int scaledSize = Math.max(22, 32 - displayContents.length() / 4);
		contentsTextView.setTextSize(TypedValue.COMPLEX_UNIT_SP, scaledSize);

		TextView supplementTextView = (TextView) findViewById(R.id.contents_supplement_text_view);
		supplementTextView.setText("");
		supplementTextView.setOnClickListener(null);
		if (PreferenceManager.getDefaultSharedPreferences(this).getBoolean(
				PreferencesActivity.KEY_SUPPLEMENTAL, true))
		{
			SupplementalInfoRetriever.maybeInvokeRetrieval(supplementTextView, resultHandler.getResult(),
					handler, this);
		}

		int buttonCount = resultHandler.getButtonCount();
		ViewGroup buttonView = (ViewGroup) findViewById(R.id.result_button_view);
		buttonView.requestFocus();
		for (int x = 0; x < ResultHandler.MAX_BUTTON_COUNT; x++)
		{
			TextView button = (TextView) buttonView.getChildAt(x);
			if (x < buttonCount)
			{
				button.setVisibility(View.VISIBLE);
				button.setText(resultHandler.getButtonText(x));
				button.setOnClickListener(new ResultButtonListener(resultHandler, x));
			} else
			{
				button.setVisibility(View.GONE);
			}
		}

		if (copyToClipboard && !resultHandler.areContentsSecure())
		{
			ClipboardManager clipboard = (ClipboardManager) getSystemService(CLIPBOARD_SERVICE);
			clipboard.setText(displayContents);
		}
	}

	// Briefly show the contents of the barcode, then handle the result outside Barcode Scanner.
	private void handleDecodeExternally(Result rawResult, ResultHandler resultHandler, Bitmap barcode)
	{
		viewfinderView.drawResultBitmap(barcode);

		// Since this message will only be shown for a second, just tell the user what kind of
		// barcode was found (e.g. contact info) rather than the full contents, which they won't
		// have time to read.
		statusView.setText(getString(resultHandler.getDisplayTitle()));

		if (copyToClipboard && !resultHandler.areContentsSecure())
		{
			ClipboardManager clipboard = (ClipboardManager) getSystemService(CLIPBOARD_SERVICE);
			clipboard.setText(resultHandler.getDisplayContents());
		}

		if (source == Source.NATIVE_APP_INTENT)
		{
			// Hand back whatever action they requested - this can be changed to Intents.Scan.ACTION when
			// the deprecated intent is retired.
			Intent intent = new Intent(getIntent().getAction());
			intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
			intent.putExtra(Intents.Scan.RESULT, rawResult.toString());
			intent.putExtra(Intents.Scan.RESULT_FORMAT, rawResult.getBarcodeFormat().toString());
			byte[] rawBytes = rawResult.getRawBytes();
			if (rawBytes != null && rawBytes.length > 0)
			{
				intent.putExtra(Intents.Scan.RESULT_BYTES, rawBytes);
			}
			Message message = Message.obtain(handler, R.id.return_scan_result);
			message.obj = intent;
			handler.sendMessageDelayed(message, INTENT_RESULT_DURATION);
		} else if (source == Source.PRODUCT_SEARCH_LINK)
		{
			// Reformulate the URL which triggered us into a query, so that the request goes to the same
			// TLD as the scan URL.
			Message message = Message.obtain(handler, R.id.launch_product_query);
			int end = sourceUrl.lastIndexOf("/scan");
			message.obj = sourceUrl.substring(0, end) + "?q=" +
					resultHandler.getDisplayContents().toString() + "&source=zxing";
			handler.sendMessageDelayed(message, INTENT_RESULT_DURATION);
		} else if (source == Source.ZXING_LINK)
		{
			// Replace each occurrence of RETURN_CODE_PLACEHOLDER in the returnUrlTemplate
			// with the scanned code. This allows both queries and REST-style URLs to work.
			Message message = Message.obtain(handler, R.id.launch_product_query);
			message.obj = returnUrlTemplate.replace(RETURN_CODE_PLACEHOLDER,
					resultHandler.getDisplayContents().toString());
			handler.sendMessageDelayed(message, INTENT_RESULT_DURATION);
		}
	}

	/**
	 * We want the help screen to be shown automatically the first time a new version of the app is
	 * run. The easiest way to do this is to check android:versionCode from the manifest, and compare
	 * it to a value stored as a preference.
	 */
	private boolean showHelpOnFirstLaunch()
	{
		try
		{
			PackageInfo info = getPackageManager().getPackageInfo(PACKAGE_NAME, 0);
			int currentVersion = info.versionCode;
			// Since we're paying to talk to the PackageManager anyway, it makes sense to cache the app
			// version name here for display in the about box later.
			this.versionName = info.versionName;
			SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
			int lastVersion = prefs.getInt(PreferencesActivity.KEY_HELP_VERSION_SHOWN, 0);
			if (currentVersion > lastVersion)
			{
				prefs.edit().putInt(PreferencesActivity.KEY_HELP_VERSION_SHOWN, currentVersion).commit();
				Intent intent = new Intent(this, HelpActivity.class);
				intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
				// Show the default page on a clean install, and the what's new page on an upgrade.
				String page = lastVersion == 0 ? HelpActivity.DEFAULT_PAGE : HelpActivity.WHATS_NEW_PAGE;
				intent.putExtra(HelpActivity.REQUESTED_PAGE_KEY, page);
				startActivity(intent);
				return true;
			}
		} catch (PackageManager.NameNotFoundException e)
		{
			Log.w(TAG, e);
		}
		return false;
	}

	private void initCamera(SurfaceHolder surfaceHolder)
	{
		try
		{
			CameraManager.get().openDriver(surfaceHolder);
			// Creating the handler starts the preview, which can also throw a RuntimeException.
			if (handler == null)
			{
				handler = new CaptureActivityHandler(this, decodeFormats, characterSet);
			}
		} catch (IOException ioe)
		{
			Log.w(TAG, ioe);
			displayFrameworkBugMessageAndExit();
		} catch (RuntimeException e)
		{
			// Barcode Scanner has seen crashes in the wild of this variety:
			// java.?lang.?RuntimeException: Fail to connect to camera service
			Log.w(TAG, "Unexpected error initializating camera", e);
			displayFrameworkBugMessageAndExit();
		}
	}

	private void displayFrameworkBugMessageAndExit()
	{
		AlertDialog.Builder builder = new AlertDialog.Builder(this);
		builder.setTitle(getString(R.string.app_name));
		builder.setMessage(getString(R.string.msg_camera_framework_bug));
		builder.setPositiveButton(R.string.button_ok, new FinishListener(this));
		builder.setOnCancelListener(new FinishListener(this));
		builder.show();
	}

	private void resetStatusView()
	{
		resultView.setVisibility(View.GONE);
		statusView.setText(R.string.msg_default_status);
		statusView.setVisibility(View.VISIBLE);
		viewfinderView.setVisibility(View.VISIBLE);
		lastResult = null;
	}

	public void drawViewfinder()
	{
		viewfinderView.drawViewfinder();
	}
}
